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Opponents of the plan said the facility's drilling, known as fracking, and exportation of gas would negatively affect the environment.

"We're asking the Public Service Commission to reject it, and we're asking our senators, Barbara Mikulski and Ben Cardin, to demand a full environmental impact statement," said protester Mike Tidwell, the director of the Chesapeake Climate Action Network.

The Cove Point facility was proposed by Virginia-based energy company Dominion Power. Dominion maintains the plant could give a significant boost to jobs in Calvert County.